I changed the batteries in the jet 3 ultra. Chair will work but batteries will not charge

SOURCE: Jet 3 Ultra won't charge

You can find the Fuse behind the foot rest. Take the pin located under the foot rest, and the casing will come off exposing the fuse.

SOURCE: Jet 3 Ultra, batteries 1 yr old, charge voltage

Mark Batteries your charger is putting our enuf 13.15 volts for each battery so after charging all night you should be reading about 13 volts on each. If your batts are only 12 volts after all night charge then batteries are weak Hope this helps

Testimonial: "Thanks very much! I wa not sure if the charger was outputting enough voltage to charge the batts, You have confirmed that the batts need replacement"

Tom Carson

• 3083 Answers
• Posted on Nov 07, 2010

SOURCE: had not used the

You'll have to get to the battery terminals while they're charging, and then you can measure the charger voltage, if any (around 12 v).
It sounds like your charger is bad, and you can order one from this site:
http://www.monsterscooterparts.com/jet3ultra.html
Good luck, and hope this helps you.

SOURCE: charging system on a Jet 3 ultra power chair

rectifier on charger